Forex taxes in Poland: accountant or DIY filing?

Compare help with a Polish PIT-38 return after checking the documents and the questions they leave unresolved. Two complete PIT-8C statements can be easier to reconcile than one incomplete multicurrency account. This article compares self-filing, a review of your calculations and a complete service by scope, price, required work and responsibility.

What actually has to be reported?

A Polish resident’s qualifying private Article 30b(1) derivative income is reported on the PIT-38 form. Establish the income category, eligible costs and deductions before applying the 19% rate. Business transactions, other products and the separate solidarity levy require their own assessment. For 2025 the ordinary filing/payment deadline was 30 April 2026; another year needs its applicable deadline and non-working-day rules.

Check whether your actual contracting brokerage entity must provide PIT-8C and which transactions its statement covers. Reconcile that information with your records; an office may assist with the calculation. A foreign brand or account address alone does not establish an income-source country or a PIT/ZG obligation.

Reconcile the main figures even when someone else prepares the return. Keep the calculations, supporting records and filing confirmation so the result can be explained.

Separate preparation from professional legal advice

Polish Articles 2 and 3 of the Tax Advisers Act distinguish preparing declarations and keeping records from regulated professional advice and representation. Identify who provides the legal opinion and under which authority. The old MF bookkeeping certificate is not a newly issued mandatory licence: issuance proceedings ended in 2014. Ask about relevant experience, insurance scope and exclusions; insurance does not guarantee payment for every error. Taxpayer liability and a provider’s possible damages liability remain separate.

An accounting office — what the fee actually buys

Agree which tasks the office actually undertakes: reconciling records, establishing conversion dates, preparing the return, submitting it or reviewing your own calculation. You must still supply complete documents and review uncertainties. Several accounts or many positions do not establish a preparation time or guarantee that one phone call finishes the work.

Ask whether the service includes an explanation of calculations, retention of supporting documents, corrections and replies to later questions. These are contract terms to establish, not automatic features of every office or a promise that the tax authority will accept the result.

Request a written price for the actual accounts, instruments, years, conversions, loss deductions, annexes and submission. Specify charges for missing data and later corrections. Ask who has relevant experience and professional authority; neither a familiar brand nor a low headline price establishes competence.

Doing it yourself — when that is realistic

With PIT-8C data, start by reconciling the return prepared in Twój e-PIT. For tax year 2025, the MF brochure says a PIT-38 containing exclusively PIT-8C revenue and costs is automatically accepted on 30 April 2026 if it was not accepted, rejected or replaced by another return. Other revenue or costs require your own complete filing. Check the filed return and retain its UPO.

For foreign-currency amounts, identify when revenue arose or a deductible cost was incurred. Use the average NBP rate from the last working day preceding that event. Do not substitute an account-wide annual rate or assume that the event must differ from the trade date. Reconcile each amount and rate in a spreadsheet.

Check each proposed deduction against the rules for its income source and supporting documents. Broker commissions and transaction costs may qualify; an invoice for software, data, training or equipment does not by itself establish deductibility. The PIT-38 brochure allows documented additional costs connected with reported revenue, but does not make every trading-related purchase deductible.

The comparison across five criteria

When to hire an accounting office

Consider a hypothetical trader with two accounts, one supplying PIT-8C and one requiring an independent calculation. The office must reconcile both records, establish currency conversions and examine whether any income is foreign-source under the relevant rules. Compare its written scope and price with the work you can document yourself.

Two documents can describe the same operations

Assume a Polish private Article 30b model for 2025, with PIT-8C revenue of PLN 12,000 and eligible costs of PLN 10,000. A supplementary history contains exactly those same operations and sums. There are no other items, exemptions, loss deductions or foreign credit. Correct reconciliation gives PLN 2,000 income and PLN 380 at 19%. Adding both documents independently would give PLN 24,000 revenue, PLN 20,000 costs, PLN 4,000 income and PLN 760 tax: PLN 380 extra from duplication.

Equal totals alone do not prove duplication. Compare entity, account, year, instruments and actual operation coverage; independent accounts can coincidentally produce the same totals. Label the history as reconciliation evidence only after confirming that relationship. Establish whether a later corrected document replaces an earlier one.

Use the unresolved problem to choose the help: a document gap, uncertain recognition date, prior-loss history, residence issue or unusual contract. A missing loss record may require a permitted correction or late original filing; it does not automatically erase the loss or restart its five-year use period. You can purchase a defined review without outsourcing every step.

When to file it yourself

Consider a hypothetical investor with one account and a reconciled PIT-8C. If all relevant data are available and understood, self-filing may be manageable. Review missing costs, prior-year losses and any other reporting obligations before treating the prepared return as complete.

Self-filing depends on complete records and your ability to check them, rather than a Polish address or a fixed trade count. Keep the original amounts, governing dates, applicable rates and separate revenue/cost totals. The full procedure is described in how to file forex taxes in practice.

The most common traps in this choice

• Assuming every accounting office knows derivatives. Ask who checks the actual instruments and whose professional authority covers any legal opinion or representation. Preparation of a return and regulated professional advice are different scopes.
• Converting currencies at the wrong rate. Identify the revenue or cost event and use the average NBP rate from the preceding working day. A broker conversion rate or one rate for the whole year is not a substitute. Check dates and arithmetic rather than assuming a particular percentage error.
• Assuming a foreign account automatically requires ORD-U. Article 82 sets the reporting entities and legal scope. A private brokerage account alone does not establish that duty; assess any separate business or other relevant status instead of treating every PIT-38 filer as categorically excluded.
• Handing over documents without an agreed price. A fee calculated after the fact, by the hour, can be a surprise when there are several hundred trades to process. Agree the rate in advance and in writing.
• Treating the office as a reason to understand nothing. Responsibility for the content of the return stays with the taxpayer, even when someone else fills it in. Ask for an explanation of where the main figures came from.

What to do before your next filing

1. List every relevant account and product. Confirm the contracting entity, reporting period, documents, corrections and which items are already included. A foreign brand does not establish a missing PIT-8C, a conversion need or a PIT/ZG obligation.
2. Download the full trade history before the year ends. Some platforms only make reports available for a limited period backwards, and once an account is closed it can be harder still. Save the statement to a file and keep it together with your deposit and withdrawal confirmations.
3. Check a representative calculation. Reconcile separate revenue and costs, their governing dates, currencies and applicable NBP rates with supporting records. Use it to identify unresolved work rather than infer that two conversions determine the whole choice.
4. Agree the work before handing over documents. Request scope, price, delivery/submission dates, correction terms and filing confirmation. Establish who signs and whether the appropriate authorization is in place; an adviser’s invoice or a draft PDF is not UPO.
5. Check prior-year losses. Record the original amount, deductions already used and the five-year window. If a loss was omitted, establish whether a late original return or a permitted correction is needed; missing the original deadline does not by itself prove that recovery is impossible.